潜热回收型喷射式制冷性能分析及喷射器数值模拟

发布时间：2018-03-17 07:05

  本文选题：制冷　切入点：潜热回收　出处：《大连海事大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着能源危机和环境污染日益严重,节能减排工作已经成为了各国的共同责任。每年,航运业都消耗了大量的能源,为了提高能源利用率,减少环境污染,利用船舶余热日益成为各国学者的研究热点。 与船舶上常用的压缩式制冷系统相比,喷射式制冷系统具有结构简单,无运动部件,能利用船舶主机余热的优点。因此,对于船舶余热的再利用,本文提出的潜热回收型喷射式制冷系统,以船舶主机余热作为潜热回收型喷射式制冷系统的热源,充分利用冷凝潜热,对系统进行性能分析。 与传统喷射式制冷系统相比,潜热回收型系统在冷凝器与主喷射器之间增加了一个增压喷射器,回收冷凝器中未被冷凝气体的潜热。本文针对潜热回收型喷射式制冷系统进行系统热力计算,探讨了潜热回收型喷射式制冷系统COP高于传统喷射式制冷系统COP的条件,研究并分析了R11、R12、R123、R134a、R600a、水六种制冷剂的两种制冷系统在相同工作条件下的工作性能,并确定水作为潜热回收型喷射式制冷系统的制冷剂。对以水作为系统制冷剂的潜热回收型喷射式制冷系统进行了变工况性能分析,研究了潜热回收型喷射式制冷系统较传统喷射式制冷系统性能优越的工作范围。 喷射器作为系统的核心部件,其性能对系统的工作性能有很大的影响。本文基于索科洛夫气动函数法,以工作流体温度90℃、引射流体温度10℃、冷凝温度30℃对系统的主喷射器进行设计,确定喷射器的结构尺寸。并使用Fluent软件对主喷射器进行数值模拟,模拟出喷射器内部流动状况。利用数值模拟方法研究并分析了工作流体参数、引射流体参数以及出口背压以及喷射器结构参数对喷射器引射系数的影响。
[Abstract]:With the energy crisis and environmental pollution becoming more and more serious, energy-saving and emission reduction work has become the common responsibility of all countries. Every year, the shipping industry consumes a lot of energy, in order to improve energy efficiency and reduce environmental pollution, The utilization of ship heat has become a hot research topic of scholars all over the world. Compared with the compression refrigeration system commonly used in ships, the jet refrigeration system has the advantages of simple structure, no moving parts and the ability to utilize the residual heat of the main engine of the ship. In this paper, the latent heat recovery jet refrigeration system is put forward. The residual heat of the ship engine is used as the heat source of the latent heat recovery jet refrigeration system, and the performance of the system is analyzed by making full use of the condensing latent heat. Compared with the traditional jet refrigeration system, the latent heat recovery system adds a turbocharger between the condenser and the main ejector. The latent heat of uncondensed gas in condenser is recovered. In this paper, the thermodynamic calculation of the latent heat recovery jet refrigeration system is carried out, and the condition that the COP of the latent heat recovery jet refrigeration system is higher than that of the traditional jet refrigeration system COP is discussed. The performance of two refrigeration systems with six refrigerants, R11, R12, R123N, R134a, R600a, under the same working conditions, has been studied and analyzed. Water is determined as the refrigerant of the latent heat recovery jet refrigeration system. The performance of the latent heat recovery jet refrigeration system with water as the refrigerant is analyzed. The working range of latent heat recovery ejector refrigeration system is studied which is superior to that of traditional jet refrigeration system. As the core component of the system, the performance of the ejector has a great influence on the working performance of the system. Based on the Sokolov pneumatic function method, the working fluid temperature is 90 鈩，

本文编号：1623654